Setup:

Windows xp
mach3
Novusun NVUM v2 controller
Knock off askpower VFD (i think)

This is my 1st major cnc build, and i am at the final hurdle - controlling the spindle via mach3 and a vfd. The novusun control board (which has caused endless confusion) is a usb parallel port emulator. Where I am currently, is the vfd reads frequency when the Spindle cw control is pressed on mach3, however, the spindle won't come to life regardless of which pin outs i put it on. The spindle works fine with the VFD in manual mode which rules out some problems, I am just very confused about the relationship between mach3 and the novusun NVUM and how this controls the spindle. Anyone got any experience with this kind of setup?